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Proceedings Paper

Smart sensor for surface inspection: concepts and prototype description
Author(s): Stephane Poujouly; Bernard A. Journet
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Paper Abstract

The purpose of this paper is to present the conception of what could be a smart laser range finder. A smart distance sensor should be able to adapt its different parameters to the real measurement case and to the different steps of the measurement process. The system chosen here is based on phase shift measurement method. The implemented solution for phase shift measurement is the IF sampling method that means under-sampling technique, associated to digital synchronous detection. Its main advantage is a global simplification of the electronic system, leading to a quite simple development of a twofold modulation frequency system that is required for high resolution measurement within a wide range. Frequencies at 10 MHz and 240 MHz have been retained and the system is designed with only one PLL, which is a digital one, reducing the phase noise. The emission and detection parts are designed for wideband operation and to be digitally controlled, in order to adapt their characteristics to the measurement situation. The whole measurement sequence is described, including different steps at both modulation frequencies, and calibration of the system.

Paper Details

Date Published: 24 April 2002
PDF: 10 pages
Proc. SPIE 4669, Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications III, (24 April 2002); doi: 10.1117/12.463426
Show Author Affiliations
Stephane Poujouly, Ecole Normale Superieure de Cachan (France)
Bernard A. Journet, Ecole Normale Superieure de Cachan (France)

Published in SPIE Proceedings Vol. 4669:
Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications III
Nitin Sampat; Morley M. Blouke; John Canosa; John Canosa; Nitin Sampat, Editor(s)

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